GitLab

* add fine-tune tutorial

* make edits, fix style

* 📝 make edits

* 🖍 fix code format links to external libraries

* 🔄revert code formatting

* 🖍 use DefaultDataCollator instead of DataCollatorWithPadding

* Fix bad examples

* Add black formatting to style_doc

* Use first nonempty line

* Put it at the right place

* Don't add spaces to empty lines

* Better templates

* Deal with triple quotes in docstrings

* Result of style_doc

* Enable mdx treatment and fix code examples in MDXs

* Result of doc styler on doc source files

* Last fixes

* Break copy from

* Convert a few docs

* And another

* Last tutorials

* New syntax for colab links

* Convert a few docs

* And another

* Last tutorials

* New syntax for colab links